I've been vaping for only around 2 years but carried on smoking till this week when I finally stopped. Finding the right device and e-juice is the hardest part to give you the same sort of hit but I have been experimenting a lot with e-juice and what I have found is that the tobacco flavours are mostly pretty nasty and the fruit flavours are too sweet! My discovery has been that the best thing to do is to mix them both to achieve something closer to perfection.
As an example I'm really enjoying Liberty Flights Home Counties 18mg mixed 75% with 25% The Alchemists Cupboard American Apple Pie or alternatively their Rhubarb Crumble - it's superb!!
Good luck.
I would also say that two other things helped me fine tune my vape:
Variable Voltage e.g a Lavatube e-cig - about £50
Variable airflow (I'm enjoying the Kanger Aerotank) - about £15
Saxon